Suppress four zizmor findings that cannot be fixed

.github/workflows/api-compat.yml

@@ -49,8 +49,15 @@ jobs:
     # bound that protects against a hung go install or git fetch.
     timeout-minutes: 10
     steps:
+      # Left persisting credentials deliberately. This job cannot push — it has
+      # contents: read — so the exposure is limited, and it runs
+      # `git fetch origin refs/tags/...` below. That fetch succeeds
+      # unauthenticated only because this repository is public; dropping the
+      # credential would make it depend on that staying true. This job is also
+      # the repository's only required status check, so breaking it blocks
+      # every pull request. Not worth it to clear one low-severity finding.
       - name: Checkout PR HEAD
-        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6   # zizmor: ignore[artipacked]
 
       - name: Set up Go
         uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6

.github/workflows/claude.yml

@@ -54,8 +54,13 @@ jobs:
       id-token: write
       actions: read # Required for Claude to read CI results on PRs
     steps:
+      # Unlike every other checkout in this repository, this one keeps its
+      # credentials on purpose. The job holds contents: write precisely so
+      # Claude can push commits to a pull request, and that push uses the
+      # credential actions/checkout leaves in .git/config. Setting
+      # persist-credentials: false here would break the action.
       - name: Checkout repository
-        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6   # zizmor: ignore[artipacked]
         with:
           fetch-depth: 1
 

.github/workflows/pr-size-label-apply.yml

@@ -1,7 +1,17 @@
 name: PR Size Labeler - Apply
 
 on:
-  workflow_run:
+  # The `workflow_run` trigger is what makes this workflow privileged, and it
+  # cannot be removed — applying a label needs write access that the calculate
+  # workflow, running on `pull_request`, deliberately does not have.
+  #
+  # What made that dangerous was trusting the artifact: the pull request number
+  # and the label were both read out of it, and the artifact is produced by a
+  # workflow the pull request author controls, forks included. Neither is now.
+  # The number is derived from this workflow's own event and the label must
+  # match a fixed list of five values, so nothing crossing the boundary can
+  # decide which pull request is acted on or what is applied to it.
+  workflow_run:   # zizmor: ignore[dangerous-triggers]
     workflows: ["PR Size Labeler - Calculate"]
     types: [completed]
 

.github/workflows/release-notes.yml

@@ -24,7 +24,14 @@
 name: Generate Release Notes
 
 on:
-  workflow_run:
+  # `workflow_run` is required here, not incidental: claude-code-action rejects
+  # the `release` event outright (see the note above), and this needs to run
+  # after the tag workflow completes.
+  #
+  # The risk this audit flags is a privileged workflow checking out an
+  # event-supplied ref. This one deliberately does not — it checks out the
+  # default branch, for the reasons set out on the checkout step below.
+  workflow_run:   # zizmor: ignore[dangerous-triggers]
     workflows: ["Create Release Tag"]
     types: [completed]
   workflow_dispatch: